<!doctype html>
<html>
<head>
    <meta charset="utf-8">
    <title>Rose - ECHARTS-GL</title>
    <meta name="viewport" content="width=device-width, initial-scale=1, user-scalable=no">
    <meta name="apple-mobile-web-app-capable" content="yes"> <!-- Fullscreen Landscape on iOS -->
    <link rel="stylesheet" href="./common.css">
</head>
<body>
<div id="main"></div>
<script src="../node_modules/echarts/dist/echarts.js"></script>
<script src="../dist/echarts-gl.js"></script>
<script src="lib/jquery.min.js"></script>
<script src="lib/dat.gui.js"></script>
<script src="js/commonUI.js"></script>
<script>
    var chart = echarts.init(document.getElementById('main'));

    var sin = Math.sin;
    var cos = Math.cos;
    var pow = Math.pow;
    var sqrt = Math.sqrt;
    var cosh = Math.cosh;
    var sinh = Math.sinh;
    var exp = Math.exp;
    var PI = Math.PI;
    var square = function (x) {
        return x * x;
    }
    var mod2 = function (a, b) {
        var c = a % b;
        return c > 0 ? c : (c + b);
    }

    var theta1 = -(20 / 9) * PI;
    var theta2 = 15 * PI;

    function getParametricEquation() {
        return {
            u: {
                min: 0,
                max: 1,
                step: 1 / 24
            },
            v: {
                min: theta1,
                max: theta2,
                step: (theta2 - theta1) / 575
            },
            x: function (x1, theta) {
                var phi = (PI / 2) * exp(-theta / (8 * PI));
                var y1 = 1.9565284531299512 * square(x1) * square(1.2768869870150188 * x1 - 1) * sin(phi);
                var X = 1 - square(1.25 * square(1 - mod2((3.6 * theta), (2 * PI)) / PI) - 0.25) / 2;
                var r = X * (x1 * sin(phi) + y1 * cos(phi));
                return r * sin(theta);
            },
            y: function (x1, theta) {
                var phi = (PI / 2) * exp(-theta / (8 * PI));
                var y1 = 1.9565284531299512 * square(x1) * square(1.2768869870150188 * x1 - 1) * sin(phi);
                var X = 1 - square(1.25 * square(1 - mod2((3.6 * theta), (2 * PI)) / PI) - 0.25) / 2;
                var r = X * (x1 * sin(phi) + y1 * cos(phi));
                return r * cos(theta);
            },
            z: function (x1, theta) {
                var phi = (PI / 2) * exp(-theta / (8 * PI));
                var y1 = 1.9565284531299512 * square(x1) * square(1.2768869870150188 * x1 - 1) * sin(phi);
                var X = 1 - square(1.25 * square(1 - mod2((3.6 * theta), (2 * PI)) / PI) - 0.25) / 2;
                var r = X * (x1 * sin(phi) + y1 * cos(phi));
                return X * (x1 * cos(phi) - y1 * sin(phi));
            }
        };
    }

    chart.setOption({
        toolbox: {
            feature: {
                saveAsImage: {
                    backgroundColor: '#111'
                }
            },
            iconStyle: {
                normal: {
                    borderColor: '#fff'
                }
            },
            left: 0
        },
        xAxis3D: {
            type: 'value'
        },
        yAxis3D: {
            type: 'value'
        },
        zAxis3D: {
            type: 'value'
        },
        grid3D: {

            show: false,

            axisPointer: {
                show: false
            },
            axisLine: {
                lineStyle: {
                    color: '#fff'
                }
            },
            postEffect: {
                enable: true,
                screenSpaceAmbientOcclusion: {
                    enable: true,
                    radius: 10,
                    intensity: 2
                },
                edge: {
                    enable: true
                }
            },
            light: {
                main: {
                    intensity: 3,
                    shadow: true,
                },
                ambient: {
                    intensity: 0
                },
                ambientCubemap: {
                    texture: 'asset/canyon.hdr',
                    exposure: 0,
                    diffuseIntensity: 1,
                    specularIntensity: 0.5
                }
            },
            viewControl: {
                // projection: 'orthographic'
            }
        },
        series: [{
            type: 'surface',
            parametric: true,
            shading: 'realistic',
            silent: true,
            wireframe: {
                show: false
            },
            realisticMaterial: {
                detailTexture: 'asset/rose.jpg',
                roughness: 0.7,
                metalness: 0,
                textureTiling: [200, 20]
            },
            itemStyle: {
                color: '#fff'
            },
            parametricEquation: getParametricEquation()
        }]
    });

    window.addEventListener('resize', function () {
        chart.resize();
    });

</script>
</body>
</html>
